Is the yongnuo yn25mm f 1 7m sharp wide open?

I haven't tested this lens for sharpness wide open, so I can't give you a verdict on it. What I can tell you is the basics: it's a 25mm f/1.7 prime for Micro Four Thirds, which frames like a 50mm on full frame, with autofocus and no stabilisation. Its lens page lists every body it fits.

If you're shooting wide open, a small f-number gives thin depth of field, so focus carefully on the eyes. For portraits, the portraits guide explains how distance and background spacing affect blur. Stopping down a little, to around f/2.8, is often the easiest way to get more of the subject sharp.

Written by Claude from this site's pages.